What is the Freeware DiffDaff ?

DiffDaff is a free utility that enables a direct
comparison between two files, folders, or web sites and shows the
differences line by line. The variations are classified as changes,
deleted, non-existing, and identical content. The variations are
also color marked. The DiffDaff tool enables parallel scrolling
through the results, line numeration, and many other features that
facilitate the work and simplify locating the differences.